1311212423 has 2 divisors, whose sum is σ = 1311212424. Its totient is φ = 1311212422.

The previous prime is 1311212417. The next prime is 1311212443. The reversal of 1311212423 is 3242121131.

It is an a-pointer prime, because the next prime (1311212443) can be obtained adding 1311212423 to its sum of digits (20).

It is a weak prime.

It is an emirp because it is prime and its reverse (3242121131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1311212423 - 2⁴ = 1311212407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311212395 and 1311212404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311212443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655606211 + 655606212.

It is an arithmetic number, because the mean of its divisors is an integer number (655606212).

Almost surely, 2^1311212423 is an apocalyptic number.

1311212423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311212423 is an equidigital number, since it uses as much as digits as its factorization.

1311212423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 20.

The square root of 1311212423 is about 36210.6672542774. The cubic root of 1311212423 is about 1094.5216381095.

Adding to 1311212423 its reverse (3242121131), we get a palindrome (4553333554).

The spelling of 1311212423 in words is "one billion, three hundred eleven million, two hundred twelve thousand, four hundred twenty-three".